2015-Present, Professor, Department of Mathematics, Statistics, and Computer Science, University of Illinois at Chicago, Chicago, IL 60607

2012-2015, Associate Professor, Department of Mathematics, Statistics, and Computer Science, University of Illinois at Chicago, Chicago, IL 60607

2010-2012, Associate Professor, Department of Mathematics, Northern Illinois University, Dekalb, IL, 60115

2005-2010, Assistant Professor, Department of Mathematics, Northern Illinois University, Dekalb, IL, 60115

2003-2005 Postdoctoral Associate, Institute for Mathematics and its Applications, University of Minnesota , Minneapolis, MN.

1998-2003, Graduate Teaching Assitant, University of Georgia Mathematics Department.